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Thread: 2008 Impala SS - The Connected Car

  1. #141
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    tripzero's Avatar
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    Thanks PaulF!

    Quote Originally Posted by PaulF View Post
    Haven't been keeping up on mp3car much lately, but I've been silently hacking on trying to come up with the absolute lowest power consumption possible.
    I've moved on to using microcontrollers for the always-on tasks (i'll post a worklog soon)
    Yeh, i'm thinking of doing the same. I want to see how much better the igepv2 is compared to the exopc...

    It's not clear if you're still fighting to get the lowest power possible, but I can offer a couple of potential pointers:

    If you're not already, you can supposedly save a ton of power on the igepv2 by installing a "tickless kernel" which will let you take advantage of ARM in the 0mhz state. I never actually did this, but
    I've been using a 30 watt solar panel, and it is just nowhere near powerful enough to keep a FitPC2 (my quick and dirty semi-low-power car pc) running (Atom @ 5-8 watts)

    The dcdc-usb claims to have >90% efficiency when regulating from 16volts to 12 volts at 2 amps. But I'm suspicious as to why the manual doesn't state any other voltages/amperages. You may want to measure how much power it's burning itself.
    If it wasn't clear by the numbers, the 19v dcdc-usb consumes 0.08A itself with nothing connected. Doing 5v appeared to be at least 90% efficient.

    For the USB hub and the igepv2 which run on 5 volts, the most efficient and easily accessible power supply I can find is this: http://www.sparkfun.com/products/10104
    It's Tiny, $29.95 8v-42v input, 5v/3.3v output, 85-90% efficiency, but you lose all the fancy features of the dcdc-usb, not sure how much they matter to you though.

    Hope you can find any of this useful.
    Yep! I was going to check up on your worklog as well. Hope you post an update soon.
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  2. #142
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    My pinetrail tablet consumes 10.2W when doing nothing with the screen & backlight off. 12.2W with the screen on. Up to 42W when the battery is charging.
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  3. #143
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    Quote Originally Posted by tripzero View Post
    My pinetrail tablet consumes 10.2W when doing nothing with the screen & backlight off. 12.2W with the screen on. Up to 42W when the battery is charging.
    Rough. Gotta love that charger efficiency haha
    My Nearly Complete Car:
    http://www.mp3car.com/vbulletin/show...ed-car-pc.html

    Micro Control Center... Control Your Car Across the Internet
    http://www.mp3car.com/fusion-brain/1...-internet.html

    Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
    http://paulfurtado.com/

  4. #144
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    In other news... IGEPv2 consumes 4W (minus 1.5W from the crappy AC-DC power supply I use inside while testing and that's only 2.5W). So the igep will run headless for a while until I get graphics and what not set up on it (maybe try the beagleboard xm since it probably has the best support of all these dev boards?). I'll hibernate or suspend the exoPC when the car shuts off and just use it as a display. I also found this bad boy: http://www.androidtabletbay.com/zeni...reen_p622.html

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    It comes with android but there is a version called the "vivaldi" that will ship with mer (http://merproject.org)... a meego/maemo-based community project. It's pretty cheap so if anything, it'll be a toy for my kids.

    The new solar panel is making me somewhat happy. I measured the current yesterday when we finally had a sunny day. It was pushing 500mA+ @ ~19v (about 9W). The battery was full so I'm hoping it'll pump more current when it's actually charging as opposed to just "maintaining" the battery. We'll see...
    Last edited by tripzero; 03-25-2012 at 06:13 PM.
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  5. #145
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    Update!

    I've put in some work and made several enhancements to the system. First, there were a number of problems:

    1) battery isolator relay b0rked. I think this was caused by numerous switches due to fluctuation of the current/voltage of the ACC line while cranking.
    2) No way of reliably reading current from the solar panel at any given moment without unhooking things
    3) Need a way of turning on/off the pc under certain conditions such as battery voltage, time of day and weather conditions. This is because I may not want the pc on if there is no sun, like at night, or if there is little sun and low battery voltage.

    Enter Arduino:

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    Components includes:

    - Digital temperature sensor:
    http://www.sparkfun.com/products/9418

    - Real time clock with battery backup:
    http://www.sparkfun.com/products/99

    - 5A current sensor:
    http://www.sparkfun.com/products/8882

    - 4 relay board:
    http://www.amazon.com/SainSmart-4-Ch...ref=pd_sim_t_1

    - 2x16 LCD screen:
    http://www.amazon.com/SainSmart-Keyp...=sainsmart+lcd

    This solves my 3 problems by:

    1) delaying the ignition state for 2.5s. That way, the engine has started before the batteries are linked and voltage/current levels should be stable.
    2) lcd screen displays temperature, time, and current from solar panel
    3) relay for turning off the pc under certain conditions

    Coding the arduino is really easy if you know c/c++. In one night I had it working and I've only spent an hour since tweaking the code which included having it shutting off the backlight when the vehicle is off to save power.

    I also have the arduino sending data to the pc over usb. Overall, I think the aruino is a much more powerful platform than the fusion brain and at a fraction of the price.
    Former author of LinuxICE, nghost, nobdy.
    Current author of Automotive Message Broker (AMB).
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  6. #146
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    Forgot to add pics of the solar panel after painting:

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    and in the window of the back seat:

    Name:  solarpanel2.jpg
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    Former author of LinuxICE, nghost, nobdy.
    Current author of Automotive Message Broker (AMB).
    Works on Tizen IVI. Does not represent anyone or anything but himself.

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